TETRANDRIA, TETRAGYNIA. 
95 
roundish ; four minute infertile filaments opposite the petals. 
Styles none. Stigmata four, like so many minute points. Cap^ 
sules four, oblong, compressed, somewhat divergent at the 
points, six to eight seeded, opening internally and longitudi- 
nally, remaining connected at the base, so as to resemble a 
single capsule of four valves. Seeds oblong cylindric, brown- 
ish, attached in two rows to the margins of each capsule — 
Mutt^ Journal Acad- Nat. Sc. PhiL vol. 1. p. 114. 
This minute subaquatic plant was first discovered, as an in- 
habitant of this country, by Mr. Nuttall, from whose accurate 
description I have copied the above account. In company with 
that gentleman, I subsequently found it, where he had detected 
it. It appears that it has more recently been found by Dr. 
Ives near Newhaven, who has erroneously referred it to the 
T. connata of South America, for it does not agree with the 
figure of that plant in the Flora Peruviana. — On the miry and 
gravelly shores of the Delaware, subject to the overflowing 
of the tide, just above Kensington, abundant. Annual. July 
to September. 
90. POTAMOGETON, X. Gen. pi. 234. (Najades.J 
Calix 4-leaved. Corolla 0. Style 0. Seeds 4. 
Leaves sheathing ; those of the stem often attenuated, floral 
leaves mostly opposite ; flowers spiked, terminal, or axillary; 
ramuli and spikes, having frequently 2 sheaths at the base. 
Nutl-seeded, cochleate; embryon erect, exalbuminous, curv- 
ed, involute . — Nutu 
1. P. leaves swimming by long petioles, sublanceo- natans ^ 
late oval, the first ones sometimes subcordate. — mx. 
Mich. 
In ponds, ditches, and slow-flowing waters. Flowers in 
terminal and rarely axillary spikes — small and green. Very 
abundant on the road to Gloucester Point. Perennial. June, 
July. 
2. P. lower leaves very long, linear ; upper ones Ian- Auitans, 
ceolate, nerved coriaceous, all-petiolated. — Wtlld, 
In similar places, but less common. Also on the road to 
Gloucester Point. Perennial. July. 
